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Date: Wed, 15 May 2024 12:12:40 +0200
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Subject: Re: Wrong value for |FileNormalizedNameInfo| (|24| vs. |48|) in
Cygwin 3.6 /usr/include ...
To: cygwin AT cygwin DOT com
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From: Roland Mainz via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Roland Mainz <roland DOT mainz AT nrubsig DOT org>
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On Sat, May 11, 2024 at 6:17 PM Brian Inglis via Cygwin
<cygwin AT cygwin DOT com> wrote:
> On 2024-05-11 05:30, Roland Mainz via Cygwin wrote:
> > I'm writing a test program for |FileNormalizedNameInfo| right now (see
> > https://rovema.kpaste.net/07074abc).
> > Per https://learn.microsoft.com/en-us/windows/win32/api/minwinbase/ne-minwinbase-file_info_by_handle_class
> > |FileNormalizedNameInfo| should be |24|, but on Cygwin 3.6 I get the
> > value |48|.
> > Since |GetFileInformationByHandleEx()| gives me error 87 (="Invalid
> > Parameter") for |48|, but works as intended for |24| I assume that the
> > Cygwin header is wrong.
> >
> > Could someone please check the Cygwin header files ?
>
> Could someone please read the enum constant names and classes carefully?
>
> Package w32api-headers:
>
> > Headers:
> > ---- snip ----
> > $ grep -r FileNormalizedNameInfo /usr/include/
> > /usr/include/w32api/ddk/wdm.h:  FileNormalizedNameInformation,
> > /usr/include/w32api/minwinbase.h:    *FileNormalizedNameInfo*,
> > /usr/include/w32api/winternl.h:    FileNormalizedNameInformation = 48,
> > ---- snip ----
>
> *FileNormalizedNameInfo* 24/0x18 is defined in minwinbase.h
> FILE_INFO_BY_HANDLE_CLASS for GetFileInformationByHandleEx whereas
> *FileNormalizedNameInformation* 44/0x2e is defined in winternl.h
> FILE_INFORMATION_CLASS for NtQueryInformationFile:
>
> https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/nf-ntifs-ntqueryinformationfile
>
> ditto in ddk/wdm.h!

Something is still wrong on my side, with Cygwin 3.6 on Windows 10:

Example:
---- snip ----
#define UNICODE 1
#define _UNICODE 1

#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
#include <stdbool.h>

int main(int ac, char *av[])
{
    (void)printf("FileNormalizedNameInfo=%d/0x%x\n",
        (int)FileNormalizedNameInfo,
        (int)FileNormalizedNameInfo);

    return EXIT_SUCCESS;
}
---- snip ----

Compiling this with $ gcc -Wall test4.c -o test4 # and running it returns this:
---- snip ----
$ ./test4
FileNormalizedNameInfo=22/0x16
---- snip ----
The expected output would be "FileNormalizedNameInfo=24/0x18", because
in https://learn.microsoft.com/de-de/windows/win32/api/minwinbase/ne-minwinbase-file_info_by_handle_class
|FileNormalizedNameInfo| is in position 24.

Looking at /usr/include/w32api/minwinbase.h:
---- snip ----
  typedef enum _FILE_INFO_BY_HANDLE_CLASS {
   FileBasicInfo /* is zero? */,
   FileStandardInfo,
   FileNameInfo,
   FileRenameInfo,
   FileDispositionInfo,
   FileAllocationInfo,
   FileEndOfFileInfo,
   FileStreamInfo,
   FileCompressionInfo,
   FileAttributeTagInfo,
   FileIdBothDirectoryInfo,
   FileIdBothDirectoryRestartInfo,
   FileIoPriorityHintInfo,
   FileRemoteProtocolInfo,
   FileFullDirectoryInfo,
   FileFullDirectoryRestartInfo,
#if _WIN32_WINNT >= 0x0602
   FileStorageInfo,
   FileAlignmentInfo,
   FileIdInfo,
   FileIdExtdDirectoryInfo,
   FileIdExtdDirectoryRestartInfo,
#endif
#if _WIN32_WINNT >= 0x0A000002
   FileDispositionInfoEx,
   FileRenameInfoEx,
#endif
   FileCaseSensitiveInfo,
   FileNormalizedNameInfo,
   MaximumFileInfoByHandleClass
 } FILE_INFO_BY_HANDLE_CLASS, *PFILE_INFO_BY_HANDLE_CLASS;
#endif
---- snip ----

This code cannot work, because the integer value for
|FileNormalizedNameInfo| enum shift with different Windows versions,
e.g. |FileNormalizedNameInfo| has value |22| if |_WIN32_WINNT==0x0602|
but value |24| if |_WIN32_WINNT==0x0A000002|.

I filed https://github.com/mingw-w64/mingw-w64/issues/48 for the
issue, but it would be nice if this can be fixed in both Cygwin 3.5
and 3.6...

----

Bye,
Roland
-- 
  __ .  . __
 (o.\ \/ /.o) roland DOT mainz AT nrubsig DOT org
  \__\/\/__/  MPEG specialist, C&&JAVA&&Sun&&Unix programmer
  /O /==\ O\  TEL +49 641 3992797
 (;O/ \/ \O;)

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